The CMX981 is an extremely low-power device is an advanced digital-radio baseband processor combined with an on-chip voice codec/processor and audio PA. The CMX981 interfaces the analog and digital sections of a digital radio system and performs the critical DSP-intensive functions. The CMX981 supports digital fixed, portable, and mobile TETRA system applications and is sufficiently flexible for use in other demanding digital radio systems. The CMX981 transmit path comprises all the functions required to convert digital 'symbol' data into suitably filtered analog I and Q signals for external up-conversion and transmission. Also available to the Tx function is digital control of output amplitudes and offsets; all in-path digital filters are fully programmable. Requiring only 2.7 volts and a very low operating current, the CMX981 is available in a 64-lead TQFP package.